fix: Add proxy configuration in Dockerfile and remove hardcoded environment variables

Dockerfile

@@ -4,6 +4,7 @@ FROM python:3.10-slim AS builder
 # Install build-time packages and Python dependencies in one layer
 WORKDIR /app
 COPY requirements.txt /app/requirements.txt
+RUN echo 'Acquire::http::Proxy "http://192.168.88.14:3142";' > /etc/apt/apt.conf.d/90proxy
 RUN apt-get update \
     && apt-get install -y --no-install-recommends build-essential gcc libpq-dev \
     && python -m pip install --upgrade pip \
@@ -18,15 +19,7 @@ WORKDIR /app
 COPY --from=builder /install /usr/local
 
 # Production environment variables
-ENV PYTHONDONTWRITEBYTECODE=1 \
-	PYTHONUNBUFFERED=1 \
-	DATABASE_DRIVER=postgresql \
-	DATABASE_HOST=localhost \
-	DATABASE_PORT=5432 \
-	DATABASE_USER=calminer \
-	DATABASE_PASSWORD=changeme \
-	DATABASE_NAME=calminer \
-	DATABASE_SCHEMA=public
+COPY .env /app/.env
 
 # Copy application code
 COPY . /app